How to Get People to Treat You Right: The Science Behind Trust

Know it or not, you often decide whether or not to trust someone based on crazy reasons. How attractive someone is, whether they’re the same gender as you are, whether someone blushes, and the state of your ever-changing mood all affect whether you trust somebody.

In some situations you trust people more just because they have a beard:

…male politicians might want to consider not shaving because the “presence of a beard on the face of candidates could boost their charisma, reliability, and above all their expertise as perceived by voters, with positive effects on voting intention.”